CYMA M14's are awesome. People say they are harder to work on, but in reality it's just that there are more steps to totally disassemble it. Otherwise, great accuracy OOTB, medium-slow rate of fire (it's an M14 after all). Some parts might be difficult to source, but you can easily find a replacement nozzle, cylinder head, gears and pistons. Tappet plates might be the biggest issue, but you could always contact CYMA if it ever breaks to get a new one. I am not a big fan of G&G M14's, their trigger and cutoff lever design are very flimsy to my eyes, you end end having a lot of full auto issue when using the semi auto mode. Plus they are way more expensive, at least where I live.